Accession Number:

AD0412709

Title:

EFFECT OF ELECTROMAGNETIC PROPAGATION ON THE MAGNETOSTATIC MODES,

Descriptive Note:

Corporate Author:

MICHIGAN UNIV ANN ARBOR COOLEY ELECTRONICS LAB

Personal Author(s):

• Ribbens,W.B.

Report Date:

1963-06-01

Pagination or Media Count:

23.0

Abstract:

The second-order effect of electromagnetic propagation on the esentially static-field distribution of the magnetostatic modes of a ferromagnetic sample is obtained by an iteration type technique. It is found that the magneto static potential constitutes the source in a mathematical sense for a second-order correct field distribution. The internal sample fields are investigated for a ferrite cylinder enclosed between parallel conducting plates and they are found to consist of resonant modes whose fre quencies are determined from a characteristic equation. These frequencies reduce to those of the magnetostatic modes in the limit of vanish ingly-small wave numbers. For a nonzero wave number the frequencies differ from the correspond ing magnetostatic limits by an amount which depends on the sample shape. The resonant fre quencies are size-dependent as contrasted to the size-independent magnetc modes. It was found that no resonant frequencies are possible above a critical value which depends on the spacing between the plates. A sample mode, whose resonant frequency is in a region forbidden to the magnetostatic modes, can exist if the sample size exceeds a critical value. Author

Descriptors:

• *ELECTROMAGNETIC FIELDS
• PROPAGATION
• FERRITES
• TENSOR ANALYSIS
• FUNCTIONS(MATHEMATICS)
• FREQUENCY
• RESONANCE
• BESSEL FUNCTIONS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE